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PRODID:UW-Madison-Physics-Events
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SEQUENCE:3
UID:UW-Physics-Event-8157
DTSTART:20230419T180000Z
DTEND:20230419T193000Z
DTSTAMP:20260414T051255Z
LAST-MODIFIED:20230328T161511Z
LOCATION:Chamberlin 5280
SUMMARY:New inflationary probes of axion dark matter\, Theory Seminar 
 (High Energy/Cosmology)\, Lingfeng Li\, Brown University
DESCRIPTION:If a light axion is present during inflation and becomes p
 art of dark matter afterwards\, its quantum fluctuations contribute to
  dark matter isocurvature. In this article\, we introduce a whole new 
 suite of cosmological observables for axion isocurvature\, which could
  help test the presence of axions\, as well as its coupling to the inf
 laton and other heavy spectator fields during inflation such as the ra
 dial mode of the Peccei-Quinn field. They include correlated clock sig
 nals in the curvature and isocurvature spectra\, and mixed cosmologica
 l-collider non-Gaussianities involving both curvature and isocurvature
  fluctuations with shapes and running unconstrained by the current dat
 a. Taking into account of the existing strong constraints on axion iso
 curvature fluctuations from the CMB\, these novel signals could still 
 be sizable and potentially observable. In some models\, the signals\, 
 if observed\, could even help us significantly narrow down the range o
 f the inflationary Hubble scale\, a crucial parameter difficult to be 
 determined in general\, independent of the tensor mode.
URL:https://www.physics.wisc.edu/events/?id=8157
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